PLA vs TPU: When to Use Rigid vs Flexible Filament

PLA is rigid. TPU bends. They're both popular, but they solve completely different problems. Here's when to use which.

PLA: the rigid creator

• Print temp: 190–230 °C
• Bed temp: 50–60 °C
• Speed: 50–200 mm/s
• Flexibility: None—brittle under bending
• Strength: Stiff and dimensionally stable
• Best for: Figurines, prototypes, rigid housings, decor, gears (low load), display pieces

TPU: the flexible workhorse

• Print temp: 220–240 °C
• Bed temp: 30–60 °C
• Speed: 15–30 mm/s (much slower!)
• Flexibility: Bends and flexes, returns to shape
• Strength: Impact-resistant, won't shatter
• Best for: Phone cases, gaskets, foot pads, wearables, flexible hinges, grips

How to choose

• Need it to bend or absorb impact? → TPU
• Need crisp details and dimensional accuracy? → PLA
• Need it to survive a drop? → TPU
• Need it to hold a precise shape? → PLA
• Need it to seal or cushion? → TPU
• Need it to look good on a shelf? → PLA

Key differences in practice

• TPU prints much slower (15–30 mm/s vs 50–200 mm/s)
• TPU needs a direct drive extruder (Bowden struggles)
• PLA needs no special hardware
• TPU doesn't need cooling fan; PLA needs 100%
• TPU is more forgiving of bed adhesion issues

The honest truth Most makers start with PLA and stay there for 80% of projects. TPU is a specialist material for specific parts. Keep a spool of TPU for when you need flexibility, but don't expect it to replace PLA as your daily driver.

Arkforge PLA is the perfect starting point—rigid, detailed, and easy to print. When you need flexibility, add TPU later.

Build your filament kit with Arkforge PLA.

Happy printing!

– Arkforge Team